Lens group with split lens and assembling method thereof

Abstract

The invention relates to the technical field of lens assemblies, and provides a lens group with split lenses and an assembling method thereof, the lens group comprises a plurality of split lenses which are connected in sequence, each split lens comprises a lens barrel which comprises an eyepiece end and a closing end, a through groove is arranged between the eyepiece end and the closing end, a first assembling surface is arranged on the outer wall surface of the lens barrel, and a second assembling surface is arranged on the outer wall surface of the lens barrel; the adjacent split lenses are connected and fixed through a first assembly surface, and a second assembly surface is arranged in the through groove; the mirror frame is installed in the through groove, a third assembling face is arranged on the outer wall face of the mirror frame, and the third assembling face is installed on the second assembling face; and the first lens is mounted in the frame. The outer wall surface of the lens barrel and the through groove are tapered to form a first assembly surface and a second assembly surface, and the outer diameter of the lens frame is tapered to form a third assembly surface, so that the thickness of the lens barrel is compensated on the premise of ensuring the clearance aperture, the stability of connection between the lens barrel and the lens frame and between the lens frame and the lens is maintained, and the high precision of the optical system is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of lens components, and more particularly to a lens assembly with a split lens and an assembly method thereof. Background Art

[0002] The lens assembly is the core part of the optical system and is widely used in various optical devices such as cameras, camcorders, microscopes, telescopes, etc. The lens assembly consists of multiple optical components, each of which has a specific function and works together to achieve high-quality imaging.

[0003] In the prior art, a lens assembly includes a lens barrel, a lens frame and a lens, and the lens is assembled in the lens barrel through the lens frame. When multiple lenses in the lens assembly are arranged adjacent to each other at an angle, the adjacent lens barrel structures need to be processed to ensure that the lens assembly is assembled. However, this also means that the internal space of the lens barrel after the processing needs to be reduced. The traditional lens frame structure is not suitable for assembly into such a lens barrel and cannot be adapted to the space of the lens barrel, resulting in failure to meet the design requirement of the split lenses being arranged adjacent to each other at an angle.

[0004] Therefore, the existing technology still needs to be improved and developed. Summary of the invention

[0005] The purpose of the present invention is to provide a lens assembly with a split lens and an assembly method thereof, so as to solve the technical problem of poor adaptability between components in the split lens.

[0006] To achieve the above object, a first aspect of the present invention provides a lens assembly with a split lens, comprising a plurality of split lenses connected in sequence, wherein the split lenses include:

[0007] A lens barrel, comprising an eyepiece end and a closing end, a through groove is provided between the eyepiece end and the closing end, a first assembly surface is provided on the outer wall surface of the lens barrel, adjacent split lenses are connected and fixed via the first assembly surface, wherein the first assembly surface extends from the middle of the lens barrel to the closing end, and in the direction in which the first assembly surface extends, a vertical distance between the first assembly surface and the optical axis of the lens barrel gradually decreases, and a second assembly surface is provided in the through groove;

[0008] A mirror frame is installed in the through groove, and a third assembly surface is provided on the outer wall surface of the mirror frame, and the third assembly surface is installed on the second assembly surface;

[0009] The first lens is installed in the lens frame.

[0010] Furthermore, a receiving platform is protruding from the end surface of the closing end, and the receiving platform is provided with a bearing groove along the circumference of the closing end. A second lens is clamped in the bearing groove, and the receiving platform is provided with an avoidance opening at the position of the first assembly surface. When the second lens is clamped in the bearing groove, the second lens is exposed from the avoidance opening and has a first gap with the first assembly surface, and the side end surface of the second lens protrudes from the surface of the bearing platform.

[0011] Furthermore, the lens frame comprises a plurality of sub-lens frames, and the plurality of sub-lens frames are stacked along the optical axis direction of the through slot, and the third assembly surface is provided on the outer side wall of at least the sub-lens frame close to the closing end.

[0012] In some embodiments, the first assembly surface is an inclined plane, and a plurality of first assembly surfaces are arranged along the circumference of the split lens.

[0013] Furthermore, a plane perpendicular to the optical axis of the split lens is a reference plane, and an angle between the first assembly surface and the reference plane is 150°-165°.

[0014] In some embodiments, an adhesive layer is further included, and the first assembly surfaces of adjacent split lenses are bonded and fixed by the adhesive layer.

[0015] Furthermore, an installation gap is provided between the first assembly surfaces of adjacent split lenses, and the installation gap is used for applying the adhesive layer.

[0016] In some embodiments, the second assembly surface and the third assembly surface are bonded and fixed by the adhesive layer.

[0017] A second aspect of the present invention provides a method for assembling a lens assembly, which is used to assemble the lens assembly with a split lens as described in the above embodiment, and the assembly method comprises the following steps:

[0018] Step S1: Assemble the second lens into the lens barrel, adjust the offset and tilt between the second lens and the lens barrel, take the bottom end surface and outer diameter of the lens barrel as the reference, ensure that the offset is less than 10um and the tilt is less than 30 seconds, and then apply glue at the gap between the second lens and the lens barrel;

[0019] Step S2: glue is dispensed and cured in the gap between the side of the first lens and the lens barrel bearing groove to connect. After the curing is stable, glue is dispensed in the gap between all the first lenses and the lens barrel to seal the end and ensure the cleanliness of the internal environment of the optical system.

[0020] Step S3: After combining the first lens and the corresponding sub-frame, perform centering turning processing to make the relative inclination between the optical axis of the first lens and the mechanical axis of the sub-frame less than 30 seconds and the offset less than 10um, and perform glue curing until the first lens and the sub-frame are stably connected;

[0021] Step S4: As a whole, install the first lens and the sub-lens frame that have been cured and connected in step S2 into the lens barrel completed in step S3, and embed the bottom end of the lens frame into the corresponding supporting platform of the lens barrel. Adjust the relative inclination between the optical axis of the first lens itself and the optical axis of the optical system composed of it to be less than 30 seconds, and the offset to be less than 10um. Through the method of glue curing, make the three components stably connected to the lens barrel, screw in the locking ring, and tighten it.

[0022] In some embodiments, step S1 further includes: placing a gasket between the bottom of the first lens and the support platform of the lens barrel to adjust the relative tilt, and placing a feeler gauge between the outer diameter of the first lens and the inner diameter of the support groove of the lens barrel to control the relative offset.

[0023] The beneficial effects of the lens group with a split lens and the assembly method thereof provided by the present invention are at least that: the outer wall surface and the through groove of the lens barrel are tapered to form a first assembly surface and a second assembly surface respectively, the outer diameter of the lens frame is tapered, and the outer diameter of the lens frame is cut to form a tapered third assembly surface, so that the thickness of the lens barrel is compensated while ensuring the clearance diameter, the stability of the connection between the lens barrel and the frame, and between the frame and the lens is maintained, and a tightly connected structure is designed in a limited space to ensure stability and high precision of the optical system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A stereoscopic diagram of a lens assembly with a split lens provided by an embodiment of the present invention;

[0026] Figure 2 A stereogram of a split lens provided by an embodiment of the present invention;

[0027] Figure 3 for Figure 2 A stereogram of the split shot from another perspective;

[0028] Figure 4 for Figure 2 Front view of the middle split lens;

[0029] Figure 5 for Figure 4 Cross-sectional view of the middle split lens in the BB direction;

[0030] Figure 6 The present invention provides a flowchart of a method for assembling a lens assembly according to an embodiment of the present invention.

[0031] Among them, the reference numerals in the figure are:

[0032] 1. Mirror group;

[0033] 2. Split lens;

[0034] 3. lens barrel; 31. eyepiece end; 32. closing end; 33. through groove; 34. first assembly surface; 35. second assembly surface;

[0035] 4. Spectacle frame; 41. third assembly surface; 42. second lens; 43. avoidance opening; 44. sub-spectacle frame; 45. first lens;

[0036] 5. Receiving platform; 51. Load-bearing trough. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly or indirectly located on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on the present technical solution. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0039] According to a first aspect of an embodiment of the present invention, a lens assembly with a split lens is provided. The lens assembly with a split lens according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0040] See also Figure 1 , Figure 1The stereogram of the lens assembly with split lenses of the present invention is shown. The lens assembly 1 includes a plurality of split lenses 2 connected in sequence, wherein adjacent split lenses 2 are arranged adjacent to each other at an angle. It can be understood that the lens barrel 3 of the prior art is a conventional lens barrel 3. In the case where multiple lenses need to be arranged adjacent to each other at an angle due to design requirements, the structure of the lens barrel 3 in the adjacent lenses needs to be processed, and the internal space of the processed lens barrel 3 needs to be reduced so that the multiple split lenses 2 can be arranged at an angle.

[0041] Therefore, without any processing on the conventional lens barrel 3 and lens frame 4, the lens frame 4 structure will not be suitable for assembly into such a lens barrel 3. That is to say, if the lens barrels 3 arranged adjacent to each other at an angle need to be processed, the conventional lens frame 4 is not suitable. If the lens is processed, the space left by the processed lens barrel 3 cannot meet the installation requirements of the conventional lens frame 4.

[0042] The structures of the lens barrel 3 and the lens frame 4 in the lens assembly 1 with the split lens 2 proposed by the present invention are improved, so that the lens frame 4 can be stably and accurately installed in the lens barrel 3 while being set at an angle, thus meeting product requirements.

[0043] See also Figure 1-Figure 5 The split lens 2 includes a lens barrel 3, a lens frame 4 and a first lens 45, and the first lens 45 is assembled in the lens barrel 3 through the lens frame 4.

[0044] Continue reading Figure 1-Figure 5 The lens barrel 3 includes an eyepiece end 31 and a closing end 32, a through groove 33 is provided between the eyepiece end 31 and the closing end 32, a first assembly surface 34 is provided on the outer wall surface of the lens barrel 3, and adjacent split lenses 2 are connected and fixed through the first assembly surface 34, wherein the first assembly surface 34 extends from the middle of the lens barrel 3 to the closing end 32, and in the direction in which the first assembly surface 34 extends, the vertical distance between the first assembly surface 34 and the optical axis of the lens barrel 3 gradually decreases, and a second assembly surface 35 is provided in the through groove 33.

[0045] The second assembly surface 35 is parallel to the first assembly surface 34 . Of course, the second assembly surface 35 may not be parallel to the first assembly surface 34 . Preferably, the second assembly surface 35 in this embodiment is parallel to the first assembly surface 34 .

[0046] See also Figure 1-Figure 5 The lens frame 4 is installed in the through groove 33 , and a third assembly surface 41 is provided on the outer wall of the lens frame 4 , and the third assembly surface 41 is installed on the second assembly surface 35 . The first lens 45 is installed in the lens frame 4 .

[0047] In order to meet the requirements of angled setting, the lens barrel 3 of the present application is provided with a first assembly surface 34 on the outer wall surface, that is, the outer diameter of the lens barrel 3 is tapered. When adjacent split lenses 2 are set at an angle, the first assembly surfaces 34 of adjacent lens barrels 3 are tightly fixed, so that a lens group 1 with multiple angled split lenses 2 can be formed.

[0048] Furthermore, since the outer wall of the lens barrel 3 is tapered, if the inner wall of the lens barrel 3 is not treated, the thickness of the lens barrel 3 at the first assembly surface 34 will be reduced, thereby reducing the structural strength of the lens barrel 3 and affecting the structural strength of the assembled lens assembly 1. Figure 5 A second assembly surface 35 parallel to the first assembly surface 34 is provided in the through groove 33 of the lens barrel 3, so that each position of the lens barrel 3 can have the same thickness, and the structural strength of the lens barrel 3 is guaranteed.

[0049] At the same time, since the inner wall surface of the through groove 33 of the lens barrel 3 is provided with the second assembly surface 35, the calibers of the through groove 33 at the second assembly surface 35 and other wall surfaces are inconsistent. If the conventional lens frame 4 is directly used, the appearance of the conventional lens frame 4 will not match the lens barrel 3 of the present application. For this reason, the lens frame 4 of the present application is tapered, and the third assembly surface 41 is provided on the outer wall surface of the lens frame 4. The third assembly surface 41 is adapted to the second assembly surface 35. When the lens frame 4 is installed in the lens barrel 3, the third assembly surface 41 is installed and fixed on the second assembly surface 35, and the other outer wall surfaces of the lens frame 4 and the inner surface of the through groove 33 except the second assembly surface 35 are avoided to be tightly fixed, thereby enabling the lens frame 4 and the lens barrel 3 of the present application to be precisely adapted and installed.

[0050] The outer wall surface of the lens barrel 3 and the through groove 33 are tapered to form a first assembly surface 34 and a second assembly surface 35 respectively. The outer diameter of the frame 4 is tapered, and the outer diameter of the frame 4 is cut to form a tapered third assembly surface 41. The thickness of the lens barrel 3 is compensated while ensuring the clearance diameter, and the stability of the connection between the lens barrel 3 and the frame 4, and between the frame 4 and the lens is maintained. A tight connection structure is designed in a limited space to ensure stability and high precision of the optical system.

[0051] Further, see Figure 1-Figure 5 The first assembly surface 34 is an inclined plane, and two first assembly surfaces 34 are arranged along the circumference of the split lens 2 . Similarly, the second assembly surface 35 and the third assembly surface 41 are also inclined planes, and correspond to the positions of the first assembly surfaces 34 .

[0052] Among them, two first assembly surfaces 34 symmetrical with the central axis of the lens barrel 3 are set on each split lens 2, and the two first assembly surfaces 34 are inclined planes formed by cutting processing. The inclination here means that there is a certain angle between the first assembly surface 34 and the optical axis of the lens barrel 3. When installing the split lens 2, the first assembly surfaces 34 of two adjacent lens barrels 3 are pressed tightly, and then the pressed position is reinforced. In this way, a certain angle will be formed between the optical axes of the two adjacent lens barrels 3. Similarly, other split lenses 2 can be pressed tightly and fixed in turn in the same way, thereby realizing the angled setting of multiple split lenses 2.

[0053] In some embodiments, the number of first assembly surfaces 34 provided on each split lens 2 may also be three, four or more. For example, when three first assembly surfaces 34 are provided on the lens barrel 3 of each split lens 2, each lens barrel 3 may be connected to three other lens barrels 3 to achieve more angled settings.

[0054] Furthermore, when the outer wall surface of the lens barrel 3 is cut into a wedge shape, the first assembly surface 34 extends to more than half of the side surface of the lens barrel 3. In this way, the area of ​​the first assembly surface 34 is larger, and when multiple lens barrels 3 are butt-jointed together, there can be a larger bonding and fixing area, and the connection between the lens barrels 3 is more stable.

[0055] In some embodiments, the plane perpendicular to the optical axis of the split lens 2 is the reference plane, and the angle between the first assembly surface 34 and the reference plane is 150°-165°. Assuming that the straight line where the optical axis is located is the Z axis in the triangular coordinate system, the reference plane is the plane where the X axis and the Y axis are located, and the angle between the first assembly surface 34 and the reference plane after extension can be 150°-165°. The specific angle setting is set according to actual needs. It should be noted that the angle refers to the angle in the direction away from the lens in the Z axis direction.

[0056] Exemplarily, the angle between the first assembly surface 34 and the reference plane can be 150°, 155°, 160°, or 165°. Correspondingly, the angle between two adjacent lens barrels 3 is 60°, 50°, 40°, or 30°, respectively. The cutting angle range of the wedge-shaped bevel ensures that the angle between the lenses is in the range of 30 to 60 degrees.

[0057] In some embodiments, the lens assembly 1 further includes an adhesive layer (not shown), which refers to a surface layer formed after the adhesive is cured, and the first assembly surfaces 34 of adjacent split lenses 2 are bonded and fixed by the adhesive layer.

[0058] Furthermore, the adhesive layer is used to firmly bond two or more surfaces together to ensure good bonding and long-term stability between materials, including but not limited to epoxy resin glue, acrylic glue, polyurethane glue and hot melt glue.

[0059] When assembling two adjacent lens barrels 3, an adhesive layer is applied on the first assembly surfaces 34 of the two lens barrels 3. At this time, the adhesive layer is in liquid or semi-solid state. Then, the first assembly surfaces 34 of the two adjacent lens barrels 3 are pressed tightly together. After the adhesive layer is air-dried and solidified, a solid adhesive layer is formed. At this time, the two lens barrels 3 are also bonded and fixed by the adhesive layer.

[0060] Furthermore, an installation gap (not shown) is provided between the first assembly surfaces 34 of adjacent split lenses 2 , and the installation gap is used for applying an adhesive layer.

[0061] It can be understood that the adhesive layer itself has a certain thickness, and the installation gap is used to provide space for the adhesive layer to be applied. When each lens barrel 3 is installed and positioned, an adjustment gap of 1-2 mm is reserved between two adjacent wedge-shaped inclined surfaces (first assembly surfaces 34).

[0062] Among them, each split lens 2 is relatively offset and tilted by a bracket. After the adjustment is completed, glue is applied to the first assembly surface 34 to fix adjacent split lenses 2 to each other. The gap between the first assembly surfaces 34 is also a space reserved for adjustment.

[0063] Furthermore, the second assembly surface 35 and the third assembly surface 41 are also bonded and fixed by an adhesive layer, and the bonding and fixing method is the same as the bonding method between the first assembly surfaces 34 .

[0064] In some embodiments, see Figure 1-Figure 5 A receiving platform 5 is protruding from the end surface of the closing end 32, and a bearing groove 51 is provided on the receiving platform 5 along the circumference of the closing end 32. The second lens 42 is clamped in the bearing groove 51, and an avoidance opening 43 is opened on the receiving platform 5 at the position of the first assembly surface 34. When the second lens 42 is clamped in the bearing groove 51, the second lens 42 is exposed at the avoidance opening 43 and has a first gap with the first assembly surface 34, and the side end surface of the second lens 42 protrudes from the table surface of the bearing platform.

[0065] It should be noted that the closing end 32 faces the observation end, and a circumventing structure is designed by setting the receiving platform 5. The second lens 42 can be directly mounted on the receiving platform 5 of the lens barrel 3 through the bearing groove 51. Figure 1 It can be seen from the figure that the avoidance structure design of the closing end 32 of the lens barrel 3 is a left and right notch design made by the avoidance opening 43, which can avoid structural interference with the lens barrel 3 of the adjacent lens.

[0066] It can be seen from the closed end 32 that in addition to the wedge-shaped cutting process, the lens barrel 3 is also designed with an avoidance space, so that the lens barrel 3 can accommodate the second lens 42 installed directly at the bearing groove 51 while carrying the lens.

[0067] Furthermore, more than half of the side surface of the second lens 42 is inside the lens barrel 3, and less than half of the side surface is contained in the bearing groove 51. The lower edge of the second lens 42 where it contacts the side surface of the lens barrel 3 is sealed to ensure the cleanliness of the optical system inside the lens.

[0068] This structure is designed so that the second lens 42 is directly fixedly connected to the lens barrel 3. The side end surface of the second lens 42 is higher than the height of the receiving platform 5 of the lens barrel 3, and the protruding part of the side end surface of the second lens 42 is used for center deviation adjustment and glue fixation.

[0069] Since the side end surface of the second lens 42 is higher than the end surface of the receiving platform 5 of the lens barrel 3, that is, the side end surface of the second lens 42 is higher than the depth of the receiving platform 5 of the lens barrel 3, the centering, adjustment and glue curing of the lens are convenient.

[0070] Further, see Figure 5 The lens frame 4 includes a plurality of sub-lens frames 44, which are stacked along the optical axis direction of the through slot 33. A third assembly surface 41 is provided on the outer side wall of at least the sub-lens frame 44 close to the closing end 32, and a first lens 45 is installed in each sub-lens frame 44.

[0071] Exemplarily, the mirror frame 4 includes three sub-mirror frames 44, and the outer diameter of the second mirror frame 4 from the bottom is also tapered.

[0072] In this way, the assembly advantage of the lens is also reflected in: ensuring that the light aperture of each first lens 45 is maximized, thereby ensuring the high precision of the entire optical system.

[0073] A second aspect of the embodiments of the present invention provides a method for assembling a lens assembly, which is used to assemble the lens assembly with a split lens as described in the above embodiment. Figure 6 , the assembly method comprises the following steps:

[0074] Step S1: Assemble the second lens into the lens barrel, adjust the offset and tilt between the second lens and the lens barrel, take the bottom end surface and outer diameter of the lens barrel as the reference, ensure that the offset is less than 10um and the tilt is less than 30 seconds, and then apply glue at the gap between the second lens and the lens barrel;

[0075] Step S2: glue is dispensed and cured in the gap between the side of the first lens 45 and the bearing groove 51 of the lens barrel 3. After the curing is stable, glue is dispensed in the gap between all the first lenses 45 and the lens barrel 3 to seal the end and ensure the cleanliness of the internal environment of the optical system.

[0076] Step S3: After the first lens 45 is combined with the corresponding sub-frame 44, a centering turning process is performed to make the relative inclination between the optical axis of the first lens 45 and the mechanical axis of the sub-frame 44 less than 30 seconds and the offset less than 10um, and the glue is cured until the first lens 45 and the sub-frame 44 are stably connected;

[0077] Step S4: As a whole, install the first lens 45 and the sub-lens frame 44 that have been cured and connected in step S2 into the lens barrel 3 completed in step S3, and embed the bottom end of the lens frame 4 into the corresponding supporting platform of the lens barrel 3. Adjust the relative inclination between the optical axis of the first lens 45 and the optical axis of the optical system composed of it to be less than 30 seconds and the offset to be less than 10um. Through the method of glue curing, the three components are stably connected to the lens barrel 3, and the locking ring is screwed in and pressed tightly.

[0078] Furthermore, step S1 further includes: placing a gasket between the bottom of the first lens 45 and the bearing platform of the lens barrel 3 to adjust the relative tilt, and placing a feeler gauge between the outer diameter of the first lens 45 and the inner diameter of the bearing groove 51 of the lens barrel 3 to control the relative offset.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lens assembly with a split lens, characterized in that: The invention comprises a plurality of split lenses connected in sequence, wherein the split lenses include: A lens barrel, comprising an eyepiece end and a closing end, a through groove is provided between the eyepiece end and the closing end, a first assembly surface is provided on the outer wall surface of the lens barrel, adjacent split lenses are connected and fixed via the first assembly surface, wherein the first assembly surface extends from the middle of the lens barrel to the closing end, and in the direction in which the first assembly surface extends, a vertical distance between the first assembly surface and the optical axis of the lens barrel gradually decreases, and a second assembly surface is provided in the through groove; A mirror frame is installed in the through groove, and a third assembly surface is provided on the outer wall surface of the mirror frame, and the third assembly surface is installed on the second assembly surface; The first lens is installed in the lens frame.

2. The lens assembly with a split lens according to claim 1, characterized in that: The end surface of the closing end is protrudingly provided with a receiving platform, and the receiving platform is provided with a bearing groove along the circumference of the closing end. A second lens is clamped in the bearing groove, and the receiving platform is provided with an avoidance opening at the position of the first assembly surface. When the second lens is clamped in the bearing groove, the second lens is exposed from the avoidance opening and has a first gap with the first assembly surface, and the side end surface of the second lens protrudes from the table surface of the bearing platform.

3. The lens assembly with a split lens according to claim 2, characterized in that: The lens frame comprises a plurality of sub-lens frames, and the plurality of sub-lens frames are stacked along the optical axis direction of the through slot, and the third assembly surface is provided on the outer side wall of at least the sub-lens frame close to the closing end.

4. The lens assembly with a split lens according to any one of claims 1 to 3, characterized in that: The first assembly surface is an inclined plane, and a plurality of first assembly surfaces are arranged along the circumference of the split lens.

5. The lens assembly with a split lens according to claim 4, characterized in that: The plane perpendicular to the optical axis of the split lens is a reference plane, and the angle between the first assembly surface and the reference plane is 150°-165°.

6. The lens assembly with a split lens according to claim 5, characterized in that: It also includes an adhesive layer, through which the first assembly surfaces of adjacent split lenses are bonded and fixed.

7. The lens assembly with a split lens according to claim 6, characterized in that: An installation gap is provided between the first assembly surfaces of adjacent split lenses, and the installation gap is used for applying the adhesive layer.

8. The lens assembly with a split lens according to claim 7, characterized in that: The second assembly surface and the third assembly surface are bonded and fixed by the adhesive layer.

9. A method for assembling a lens assembly, characterized in that: For assembling the lens assembly with a split lens as claimed in claim 8, the assembly method comprises the following steps: Step S1: Assemble the second lens into the lens barrel, adjust the offset and tilt between the second lens and the lens barrel, take the bottom end surface and outer diameter of the lens barrel as the reference, ensure that the offset is less than 10um and the tilt is less than 30 seconds, and then apply glue at the gap between the second lens and the lens barrel; Step S2: glue is dispensed and cured in the gap between the side of the first lens and the lens barrel bearing groove to connect. After the curing is stable, glue is dispensed in the gap between all the first lenses and the lens barrel to seal the end and ensure the cleanliness of the internal environment of the optical system. Step S3: After combining the first lens and the corresponding sub-frame, perform centering turning processing to make the relative inclination between the optical axis of the first lens and the mechanical axis of the sub-frame less than 30 seconds and the offset less than 10um, and perform glue curing until the first lens and the sub-frame are stably connected; Step S4: As a whole, install the first lens and the sub-lens frame that have been cured and connected in step S2 into the lens barrel completed in step S3, and embed the bottom end of the lens frame into the corresponding supporting platform of the lens barrel. Adjust the relative inclination between the optical axis of the first lens itself and the optical axis of the optical system composed of it to be less than 30 seconds, and the offset to be less than 10um. Through the method of glue curing, make the three components stably connected to the lens barrel, screw in the locking ring, and tighten it.

10. The method for assembling a lens assembly according to claim 9, characterized in that: The step S1 further includes: placing a gasket between the bottom of the first lens and the bearing platform of the lens barrel to adjust the relative tilt, and placing a feeler gauge between the outer diameter of the first lens and the inner diameter of the bearing groove of the lens barrel to control the relative offset.

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